Process fob coating metals



M. M. WISE. 1

PROCESS FOFi COATING METALS.

APPLICATION FILED DEC. I1. 1918.

1,312,716. Patented Aug.12,1919.

STATES PATENT OFFICE.

MAXWELL 'M. WISE, OF DETROIT, MICHIGAN.

PROCESS FOR COATIIN' G METALS.

To all whom may concern."-

' Be it known that I, MAXWELL M. WIS 15a citizen of the United States, and residing at Detroit, in the countyof Wayne and State in intimate contact or packed in with finellly divided particles of the coating metal. T

object of the present invention is a process for coating thin sheets of "metal which will not cause these sheets to bulge, twist' or otherwise distort.

This invention consists in curving the sheets of metal, preferably by rolling them into spirals, or cylinders, then'p'acking the curved sheets in a treating chamber with finely divided coating'material, with or without the addition'of inert matter, and

- then heat'ng the sheets and coating material sufliciently to deposit the coating metal upon the sheets in a metallic state. It also consists in spacing these curved sheets by means of slender rods, wires, cablesor tapes of metal or asbestos sothat the finely divided coating material may reach every-portion .ofthe surfaces to be treated.' It further consists in turning the treating chambers during the operations in'order-that the coatries of short sheets in cylindrical form in a -rectangular treating chamber. Figs". 4

5 show different types of spacers.

- 'Similar reference characters refer to like parts throughout the several views.

Numerous attempts to coat sheets of metal by the process set forth in the Cowper- Coles Patent No. 701,298 dated June 3, 15102, have been failures because the sheets whichv were flat when placed within the treating receptacles were twisted,buckled or covered with welts or other distortions when re-., moved therefrom,

I have found that when such sheets are rolled into cylinders or spirals, the convo vSpecification of Letters Patent.

Application filed December 11. 1918. Serial m. mazes.

lutions being kept apart b separators to permit the coating metal to come into .contact with all of the surfaces of. the sheets, and these curved sheets are then placed within theztreating chambers, the spacesfilled with coating powder, and the sheets and powder heated for a proper length of time, that when removed and unrolled the sheets are as smooth and flat as when they were inserted. P

While this process is not limited to any particular material, it is especially useful in particular coating metals or to sheets of any coating sheets of iron and steel with zinc or antimony, as sheets of iron and steel are particularly liable to distort and as these sheets are usually more in need of such coating beczliluse'more readily aflected by the atmosp ere.-

The treating chamber may be of any desired cross section, the chamber 1 shown in Fig. 2 being a cylinder and the chamber 2 shown in Fig. 3, being square in .cross section; The sheets may be rolled into the spirals 3'as'shoWI1 in Figs. 1 and 2 and the convolutions may be separatedby a continuous wire 4, or the sheets 5 may be short and constitute parts ofcylinders, separated by consecutive separators 6.

. InFigfl is shown a band or tape 7 having small -'knobs.8 on opposite sides, which band also constitutes a desirable separator. The twisted m'em r 9 may be of metal or of asbestos. The rolled sheets and the spacers between them are placed within the treating chamber and' finely divided coating metal (partlyin the form of oxid and with or without an admixture of inert material such asfinely crushed sand and coke) is sifted and packed in around the sheets, after which the chambelfiis closed and then heated sufficiently to cause the finely divided coating metal to unite with thesheets in metallic state'.. The chamber is preferably rotated during this treatment.

When a flat sided treatingchamber isrotated, the'sheetsjmove into and out of the corners and bend locally even at the interior of the bundle sufliciently to lose contact with the separators, thus permitting the' finely dividedcoating metal to sift in between the sheets and the separators. When the sheets causes the lower portions 0 the convolutions of the sheets and of the separators to enare wound spirally, the wei ht ofthe bundle gage but the upper portions disengage and permit the coatlng metal to again sift in between the sheets and separators, This disengagement of, the sheets and separators 0bviates the tendency to leave an uncoated line of contact between the separators and sheets. I claim i 1. The process of coating the surfaces of sheets of metal, with zinc which consists in rolling up the sheets into cylinders or spi rals with separators between the convolutions, then placing these rolled up sheets into a treating chamber with finelydivided zinc packed around and between them, and then heatin the sheets and zinc sufficiently to deposit tlie zinc in metallic state.

2. The process of coating the surfaces of sheets of metal with zinc which consists in rolling the sheets into cylinders or spirals with separators between the convolutions, placing these rolled up sheets into a rotatable treating chamber-with finely divided zinc packed around and between them, and then rotating the chamber and heating the sheets and zinc sufficiently to deposit the zinc in metallic state.

3. The process of coating the surfaces of sheets of metal which consists in curving the sheets and packing them into a treating chamber with a powder embodying a finely divided coating metal between them, and then heating the sheets and powder sufficiently to deposit the coating metal "in metallic state. a

4. The process of coating the surfaces of sheet metal which consists in rolling the sheets into cylinders or spirals with means between the convolutions to prevent them from touching each other, applying to the sheet metal a powder embodying a nely divided coating metal, and then heating the sheets and powder sufliciently to deposit the coating metal in metallic state.

MAXWELL. M. WISE. 

